Who would ever do this?

I saw this show on tv the other night and it was about the worlds biggest waves. So i was very interested in seeing the biggest wave ever surfed. On youtube i found this video of this man surfing on this huge wave. i have no idea why a person would ever do this. From going to ocean city and having the waves there knock me over i couldnt imagine what a wave like this would do. I would never do anything like this, its crazy.